1、MILITARY SPECIFICATION LEAD PLATING, ELECTRODEPOSITED This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers electrodeposited lead plating applied to iron and steel, copper, and copper-rich surfaces (see 6.1)
2、. 1.2 Classification. Lead plating shall be of the following types and classes, as specified (see 6.2) : Type I - without preliminary copper coating Class 1 - 25 micrometers (0.001 inch) thick lead coating Class 2 - 13 nicrometers (0.0005 inch) thick lead coating Class 3 - 6 micrometers (0.00025 inc
3、h) thick lead coating Type II - with 0.33 micrometern (0.000015 inch) thick preliminary copper coating (see 6.1.2) Class 1 - 25 nicrometers (0.001 inch) thick lead coating Class 2 - 13 micrometers (0.0005 inch) thick lead coating Class 3 - 6 micrometers (0.00025 inch) thick lead coating * To attain
4、0.33 micrometer (O.OOOC15 inch) of copper from a cyanide bath operating at 50 percent cathode efficiency will require about 1 minute of plating at a current density of 16 amperes per square foot or correspondingly shorter period for higher current densities. Area BIFFP Provided by IHSNot for ResaleN
5、o reproduction or networking permitted without license from IHS-,-,-KIL-L-138 O 8B (pmt ) 2 APPLICAB1,E DOCUI3lTS 2.1 The following docunentcof the issue in effect on date of invitation for bids or request for proposal, forms a part of this specification to the extent specified herein. STANDARDS MIL
6、ITARY MIL-STD-105 - Sampling Prccedures and Tables for Inspection by MIL-STD-109 - Quality Assurance Terms and Definitions Attributes (Copies of specifications, standards, drawings, and publications re- quired by suppliers in connection with specific procurement functions should be obtained from the
7、 procuring activity or as directed by the contracting officer.) 2.2 Other publications. The following documents form a part of this specification to the extent specified herein. Unless otherwise indicate , the issue in effect on date of invitation for bids or request for proposal shall apply. Aneric
8、an Society for Testing and Materials (ASTM) Standards B 117 - Salt Spray (Fog) Testing B 487 - Measuring Metal and Oxide Coating Thickness by Microscopic B 499 - Measurement of Coating Thicknesses by the Mgn.etic Method: I: 529 - Measurement of Coating Thicknesses by the Eddy-Current Test Nonconduct
9、ive Coatings on Nonmagnetic Easis Eetals B 567 - Coating Thickness by the Beta Backscatter Principle B 568 - Coating Thickness hy X-Ray Spectrometry (Application for copies should be addressed to American Society for Examination of a Cross Section Nonmagnetic Coatings on Magnetic Basis Metal Method:
10、 Testing and Materials, 1916 Race Street, Philadelphia, Pennsylvania 19103.) (Technical society and technical association specifications and standards are generally available for reference from libraries. tributed among technical groups and using Federal agencies.) They are also dis- 2 Provided by I
11、HSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-L-L3808B HF U 7997906 0420566 7 3.2 Basis iraterial. The basis material shall be free from defects that will be detrimental to the appearance or protective value of the plating. 3.3 General requirements. tract o
12、r purchase order, the items to be plated shall be subjected to all the required mechanical operations, such as machining, brazing, welding, forming and perforating, prior to the application of the specified type and class of plating. be performed with ninimum abrasion, erosion, or pitting of the sur
13、faces. The cleaning and finishing operations shall heat treatment to remove any objectionable residul stresses, prior to being subjected to the final cleaning and plating operations. steels having a hardness of Rockwell C40 or over, shall be heat-treated for 3 hours at 1910 +14OC (375O f25OF) after
14、being plated. hardened springs and-carburized Parts, which have been heat-treated prior to plating at a temperature lower than 19lOC (3750F) shall not be subjected to the specified after plating heat treatment. Instead such parts shall be heat-treated by a method or procedure which has the previous
15、approval of the procuring agency. srecified heat treatment in anv case. However, all Plated springs shall not be flexed prior to the corresponding to the specified class of lead plating (see table I) (3.4.1.1), shall be electrodeposited directly on the surface to be pro- tected. 3 Provided by IHSNot
16、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL -L- 1 3 8 O 8B (MR) 3.3.4.2 Type II platix. A preliminary copper coating, of the thick- ness specified (see table II) (3.4,1.2), shall be electrodeposited directly on the surface to be protected. Subsequently the app
17、ropriate thickness of lead coating corresponding to the specified class of lead plating (see table I) (3.4.1.1), shall be electrodeposited on the copper coating. 3.4. Detail requirenents . 3 4.1 Thickness of coating, 3.4.1.1 Type J. plating. The average minimum thickness of the lead coating on all S
18、ignificant surfaces of the plated items (see 6.4) which can be touched by a ball 19 millimeters (0.75 inch) in diameter, shall be as shown in table I. point on the surface of the plated item shall be uot less than 7 percent of the minimum average thickness stipulated in table 1 for the specified cla
19、ss of plating. the applicable procedure specified in 4.4.1. The minimum thickness of the coating at any The thickness of the coating shall be determined by Table I. Thiclmess of lead coating for type I plating Class of _-_- Average _-._. mininiun! ._-._-_._ thicknes-s , plat dng Micrometers Inches 2
20、5 I 1 o. O01 O 0005 O. 00025 3.4.1.2 Type II plating. The average minimum thickness of the pre- liminary copper coating, and of the outer lead coating on all significant surfaces of-the plated-items (see 6.4) which can be touched by a ball 19 millimeters (0.75 inch) in diameter, shall be as shotm in
21、 table II for the specified class of plating. The minimum thickness of the copper and lead coatings at any point on the surface of the plated item shall be not less than 70 percent of the minimum average thickness shown in table I1 for the specified class of plating. shall be determined by the appli
22、cable procedure specified in 4.4.1. The thickness of the coatings Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-.- - _I_ MIL-L-L3OB MF W 97779Ob 04205
23、b9 2 W MIL-L-13 8 O 8B (NR) 3.5 Adhesion. The adhesion of the plating shall be stich that when examined at a magnification of approximately 4 diameters, it shall not show separation from the basis metal at the interface 17he.n subjected to the test specified in 4.4.3. basis metal is the surface of t
24、he basic metal before plating. The for- mation of cracks in the basis metal or plate which do not result in flaking, peeling, or blistering of the plate shall not be considered as nonconformance to this requirement. The interface between the lead and the 3.6 Workmanship. The lead plating shall be sm
25、ooth, fine grained, adherent, continuous, free from visible blisters, pi.ts, mdules, indications of burning, excessive build-up, staining and other defects. Superficial staining which has been demonstrated as resulting from rinsing, or slight discoloration resulting from baking operations to relieve
26、 embrittlement as specified above (see 3.3.3) shall not be cause for rejecti.on. All details of workmanship shall conform to the best practice for high quality plating. 4. QUALITY ASSURANCE PROVZSIOMS 4.1 Responsibility for inspection, Unless otherwise specified in Except the contract or purchase or
27、der, the supplier is responsible for the per- formance of all inspection requirements as specified herein. as otherwise specified in the contract or order, the supplier nay use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapp
28、roved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies an.d services conform to prescribed requirements. 4.1.1 Quality assurance terms and definitions. Reference shall
29、be made to MIL-STD-109 for definition of quality assurance terms. 4.2 Classification of inspection. The inspection requirements speci- fied herein are classified as quality conformance inspection (see 4.3). 4.3 Quality Conformance Inspection. 4.3.1 E, A lot shall consist of plated articles of the sa
30、me type and class and of approximately the same size, form and shape and plated under similar conditions, submitted for inspection at one time. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4.3.2 Sampling for visual examination and nondestructive t
31、ests. Sampling for visual exaniination and nondestructive tests shall be con- ducted in accordance 15th FIL-CTD-105. articles shall be selected at randoril from each lot in accordance with $IL-STD-105, Level II. to the procedures in 4.3.2.1 for visual examination and 4.3.2.2 for plating thickness (n
32、ondestructive tests) at the Acceptable Quality Level (AQL) of 1.5 percent. A sample of coated parts or The lot shall be accepted or rejected according 4.3.2.1 Visual examination. Samples selected in accordance with 4.3.2 shall be examined for compliance with the requirements of 3.6 after plating. If
33、 the nuaber of nonconforming articles exceeds the acceptance number for the sample, the lot represented by the saniple shall be rejected. 4.3.2.2 Thickness of plating (nondestructive tests). Samples selected in accordance vith 4.3.2 shall be inspected and the plating thickness measured by the applic
34、able tests detailed in 4.4.1. The part or article shall be considered nonconforming if one or more measurements fail to meet the minirrium thickness requirements (see 3.4.1.1 and 3.4.1.2). If the number of defective items in any sample exceeds the acceptance number of the specified sample, the lot r
35、epresented by the sample shall be rejected. Separate specimens (see 4.3.4) shall not be used for thickness measurements unless a need has been demonstrated. The number of separate specimens shall be as specified for sample in 4.3.3. 4.3.3 Sampling for destructive tests. A random sample selected in a
36、ccordance with table IV, or separately plated specimens prepared in accordance with 4.3.4 shall be tested from each lot for each destructive test. Table IV. Size of lot sample Number of items Nunber of items taken in the lot for lot sample 2 to 5 6 to 25 26 to 100 101 to 500 501 to 3200 Over 3200 1
37、3 4 6 10 .r, ,. * For lot sizes over 3200 use the sampling schedule of MIL-STD-105, Level C-3, QAL 1.5 percent. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4.3.3.1 Thickness of platine; (cl-estructive tests). Samples selected in accordance with
38、 4.3.3 shall be measured for plating thickness by the applicable tests detailed in 4.4.1, The part or article shall be considered nonconformlng i one or more measurements fail to meet the minimum thickness requirements (see 3.4.1.1 and 3.4.1.2) . number of defective itens in an37 sample exceeds the
39、acceptance nGmber of the specified sample, the lot represented by the sanlple shall be rejected. ness measurements unless a need has been demonstrated. If the Separate specimens (see 4.3.4) shall not be used for thick- 4.3.3.2 Adhesion (destructive tests), The articles or specinem usecl for the dest
40、ructive thickness test (see 4.3.3.1), if of suitable size and form, nay be used as the test pieces for the adhesion test to determine corr,pliance with the reqiiirements of 3.5. Failure of one or nore of the test pieces shall constitute failure of the lot, except that for lot sizes over 3200 article
41、s, the requirements of MIL-STD-105, inspection Level 5-3, AQL 15 percent shall be followed. specimens (see 4.3.4) may be used for the adhesion tests. Separate 4.3.3.3 Salt spray (destructive tests). For both types I anc! II coatings, the number of articles indicated in table IV skiall be taken. at r
42、andom from the lot to be inspected for the sait-spray tests. Failure of one or more articles in the sample shall constitute failure of the lot, except that for lot sizes over 3200 articles, the requirements of MIL- STD-105, inspection Level S-3, AQL 1.5 percent shall te followed. 4.3.3.4 Emhrittleme
43、nt relief. For both types I and LI coatings, the number of articles indicated in table Il shall be taken at random from the lot to be inspected for the embrittlement relief tests. Failure of: one or more artic1.e in the sample shall constitute failure of the lot, except that for lot sizes over 3200
44、articles, the requirenents of MIL-STD-105, inspection Level S-3, AQL 1.5 percent shal.1 be followed. 4.3,4 Separate specimens. When the plated articles are of such form as to be not readily adaptable to a test specifled herein, the test may be made by the use of separate specimens plate concurrently
45、 with the articles represented. The separate specimens shall be of a basis neta1 equivalent to that of the articles represented. metal includes condition and finish of surface prior to plating. For example, a smooth cold-rolled surface should not be employed for re- presenting a hot-rolled surface,
46、but due to the impracticability of hot forging or casting separate test specimens, hot-rolled specimens may be used when plated parts are hot forged or cast. may be strips approximately 1 inch wide, 4 inches long and 0.04 inch thick, for adhesion tests, but shall be at least 4 inc-hes wide, 6 inches
47、 long and approximately 0.04 inch thick for all other tests. “Equivalent“ basis The separate specimens These 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-L-13108E (MR) specimens shall be introduced into a lot at regular intervals prior to th
48、e cleaning operations preliminary to plating and shall not be separated therefrom until fter completion of the processing. Conditions affecting the plating of the specimens including the spacing in respect to anodes and to other objects being plated shall correspond as nearly as possible to those af
49、fecting the significant surfaces of the articles represented. 4.4 Test nethods. 4.4.1 Thickness. Separate specimens (see 4.3.4) shall not be used for thickness measurements unless a need for such specimens has been shown. Unless otherwise specified, the method of test shall be selected by the supplier with consideration given to basis metal, coating thickness, and the shape of the article. found acceptab
